feat: add callable remote workflow capabilities

src/wf_client/__init__.py

@@ -1,8 +1,16 @@
 """Transport-independent workflow client primitives."""
 
+from wf_platform import CapabilityRef, Page
+
+from .app import App
+from .capabilities import CapabilityResult, CapabilitySummary, RemoteCapability
 from .codec import (
     DecodedRunResult,
     DecodedTracePage,
+    decode_capabilities_page,
+    decode_capability_call,
+    decode_capability_diagnostics,
+    decode_capability_inspect,
     decode_dependency_diagnostics,
     decode_deployment,
     decode_run_result,
@@ -27,18 +35,28 @@ from .protocols import WorkflowClientPort
 __all__ = [
     "ArtifactNotFound",
     "ArtifactVersionConflict",
+    "App",
     "CapabilityNotFound",
+    "CapabilityRef",
+    "CapabilityResult",
+    "CapabilitySummary",
     "DecodedRunResult",
     "DecodedTracePage",
     "DeploymentNotRunnable",
     "DeploymentRequired",
     "InvalidResponse",
+    "Page",
     "ProtocolError",
+    "RemoteCapability",
     "RevisionConflict",
     "TransportError",
     "ValidationFailed",
     "WorkflowClientError",
     "WorkflowClientPort",
+    "decode_capabilities_page",
+    "decode_capability_call",
+    "decode_capability_diagnostics",
+    "decode_capability_inspect",
     "decode_dependency_diagnostics",
     "decode_deployment",
     "decode_run_result",